Large companies have massive resources which are a competitive advantage. Having these titanic companies headquartered in the US, beholden to American laws, employing Americans, being a symbol of American prowess abroad and listed on American stock exchanges is in American interests on multiple tangible & intangible levels; including allowing American engineers to command ridiculous salaries and granting the government a lot of soft-power.
The recent sanctions on Russia (and previously Huawei/ZTE) shows howuch that soft-power is worth